Klein bottles

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Klein bottles in the Mathematics Gallery, Science Museum, London.

Introduced in 1882 by Felix Klein, the bottles have no edge and neither inside nor outside.

Up the Downs 2

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The South Downs Way, East Sussex, England.

The beautiful things of the earth become more dear as they elude pursuit.

THOMAS HARDY, Desperate Remedies 1871

Submariners

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Inspecting the Inside of the  WW2 submarine at Gosport, Hampshire is an intense, claustrophobic and enthralling experience.